Hi Hingtao,
I looked at this in the lab and with the power removed from the TPS65072 it did not hold SDA or SCL low. Make sure that you are not exceeding Vsys on SDA or SCL. If you now have a short on your SDA pin to GND then I would suggest ESD damage could be a possibility. Are there multiple failed units or just the one? Is the IC drawing more current than usual or before?
Can you post scope shots of the SCL and SDA lines on a work board?